Harold had a mild stroke due to a blockage in his posterior communicating artery. He fully recovered because he got to the hospital within on hour. The neurologist states the his quick recovery was also due to the fact that this artery was part of the circle of Willis. What is circle of Willis and why the doctor say this ?

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Hematology

Hematology is the branch of biology. Hematology is the medical field that deals with the treatment of blood disorders and cancers, such as hemophilia, leukemia, lymphoma, and sickle-cell anemia. Hematologists and hematopathologists are medical professionals who specialize in illnesses of the blood and its components.